You are Here: Home >< Maths

M1 moments question

Announcements Posted on
TSR's new app is coming! Sign up here to try it first >> 17-10-2016
1. hi, for part b) of this question I got it wrong and would like some help pls. I have checked the mark scheme and realised that the position of D is actually closer to b then a. How do you know where d would be as whenever I am asked to find distance like this I always assume the pivot is very close to a... Thanks.Attachment 517721517725
Attached Images

2. (Original post by coconut64)
hi, for part b) of this question I got it wrong and would like some help pls.
How does it matter? Place it anywhere you like and call the distance - the algebra will sort itself out. You don't need to know whether d will be closer to whatever.

You should take moments from A or B instead of the centre.
3. (Original post by Zacken)
How does it matter? Place it anywhere you like and call the distance - the algebra will sort itself out. You don't need to know whether d will be closer to whatever.

You should take moments from A or B instead of the centre.
Got the right answer now thanks. I realised I used 6.5g not 6.5N .
4. (Original post by coconut64)
hi, for part b) of this question I got it wrong and would like some help pls. I have checked the mark scheme and realised that the position of D is actually closer to b then a. How do you know where d would be as whenever I am asked to find distance like this I always assume the pivot is very close to a... Thanks.Attachment 517721517725

Then you don't have to worry if the moment from the reaction of the pivot will be clockwise or anticlockwise. The algebra should work itself out anyway as Zacken has said.

You should have noticed a problem when you assumed x was less than 50 but your answer was more than 50.
5. (Original post by coconut64)
Got the right answer now thanks. I realised I used 6.5g not 6.5N .
No problem!

Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: April 1, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

How does exam reform affect you?

From GCSE to A level, it's all changing

Poll
Useful resources

Maths Forum posting guidelines

Not sure where to post? Read here first

How to use LaTex

Writing equations the easy way

Study habits of A* students

Top tips from students who have already aced their exams

Chat with other maths applicants